I'm running a Reefkeeper Lite, level 1. I bought an extra RKL used, so now I have an extra 4 outlet powerstrip (PC4) and a spare control unit and temp probe. I've used it to control the lights, heater and fans for my former 110 gallon and now my 27 gallon cube. It works perfectly, is simple, cheap, and I can now program and review data with an old laptop that is hooked up to the tank. I can remote into the old laptop from anywhere using the Logmein service. I plan to buy a couple of peristaltic pumps so I can automate my two part dosing. My ato is just a simple diy float switch kit, from aquahub, I believe. I bought the ato in 2006, and have never had a problem with it. I do like how the Apex could control my Vortechs, but for the price, I'm extremely happy with my purchase. If you just want an inexpensive, reliable, simple yet scalable controller, the ReefKeeper is the way to go in my opinion. I have less than $200 in mine, and it does everything that I want.